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A. I'm leaving B. Thank you C. I'll do my best D. and sit here E. Please sit down
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Passage Five
The Northern Pike is a very bad fish. It is a big, hungry fish, and swallows little fish such as trout and perch. Many Northern Pikes live in Lake Davis. They are killing all the smaller fish in the lake. The Northern Pike are a serious threat to the lake because they eat all the smaller fish. Soon, all other species of fish in the lake will be killed off. This is not healthy for the environment.
Experts are afraid that the Northern Pike will swim out of Lake Davis through many smaller rivers that feed into the lake. They could spread all over the country and damage many other water environments. If that happens, it would be too late to stop the Northern Pike.
For ten years, officials have been trying to remove the Northern Pike from Lake Davis. They haw. tried using nets, explosives and poisons. However, the Northern Pike population is still doing well in Lake Davis. Many people do not like the idea of using poison to kill the fish. They worry that the poi- sons are bad for humans who use the water. No trace of the poisons has ever been found in local wells, however.
Scientists are going to try the poison again. This time, they will drain the lake before they add the poison to the water. A public hearing will be held to talk about the problem.
52. Why are some people against the use of poisons to kill Northern Pike？
program.
Passage Three
How can we get rid of garbage.9 Do we have enough energy sources to meet our future energy needs？
These are two important questions that many people are asking today. Some people think that man might be able to solve both problems at the same time. They suggest using garbage as an energy source, and at the time it can save the land to hold garbage.
For a long time, people buried garbage or dumped it on empty land. Now, empty land is scarce. But more and more garbage is produced each year. However, garbage can be a good fuel to use. The things in garbage do not look like coal, petroleum, or natural gas; but they are chemically similar to these fossil fuels. As we use up our fossil-fuel supplies, we might be able to use garbage as an energy source. Burning garbage is not a new idea. Some cities in Europe and the United States have been burning garbage for years. The heat that is produced by burning garbage is used to boil water. The steam that is produced is used to make electricity or to heat nearby buildings. In Paris, France, some power plants burn almost 2 million metric tons of the cities garbage each year. The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.
Our fossil fuel supplies are limited. Burning garbage might be one kind of energy source that we can use to help meet our energy needs.
44. What two problems can man solve by burning garbage？
Passage Four
John Paul Jones was one of the founders of the United States Navy. During the Revolution, the colonies were desperate. They needed men to lead their small ships against the British fleet. Jones was more than willing to fight.
John Paul Jones had once been a captain of a British merchant ship. In 1773, his crew mutinied. One member of the crew tried to gain control of the ship. Jones shot the man to death. The mutiny took place near the port of Tobago, an island in the Caribbean. Authorities there decided to have a trial. This meant certain death for John Paul Jones, since the whole crew would testify against him. One night during a thunderstorm, he escaped from the jail.
He fled to the United States and lived with a family named Jones. His real name was John Paul. He added the name of Jones to his, in honor of the family. He outwitted the British ships that were sent to hunt him down.
When the American Revolution ended he went to serve in the Russian navy. There, he fought the Turks and achieved one of the few major naval victories in the history of Russia. He died in Paris at the age of forty-five.
John Paul Jones is considered both an American and Russian hero, but the English considered him a fugitive.
48. John Paul Jones won a major victory for the Russian navy against the ______.
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